BigValueInc via eBay has the Canon EF 24-105mm f/4L IS USM for $659.99. This is the cheapest price that we’ve seen yet from an unauthorized dealer for this lens.
BigValueInc via eBay is not an authorized dealer, but the last few sales people have reported receiving US warranty items. These lenses were split from 5D Mark III kits that were featured in a $2549 deal yesterday (it appears to be still live, with over 300 sold). This is a great lens, especially if you picked up yesterday’s deal.